package com.lbs.tsod.animal.model;

import com.vividsolutions.jts.geom.Coordinate;

/**
 * Created by toyking on 2016/6/1.
 */
public class EvilTransform {
    public final static double pi = 3.14159265358979324;

    //
    // Krasovsky 1940
    //
    // a = 6378245.0, 1/f = 298.3
    // b = a * (1 - f)
    // ee = (a^2 - b^2) / a^2;
    public final static double a = 6378245.0;
    public final static double ee = 0.00669342162296594323;

    //
    // World Geodetic System ==> Mars Geodetic System
    public static Coordinate transform(double wgLon, double wgLat) {
        Coordinate coordinate = new Coordinate(wgLat, wgLon);
        if (outOfChina(wgLat, wgLon)) {
            coordinate.y = wgLat;
            coordinate.x = wgLon;
            return coordinate;
        }
        double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
        double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
        double radLat = wgLat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        coordinate.y = wgLat + dLat;
        coordinate.x = wgLon + dLon;
        return coordinate;
    }

    // World Geodetic System ==> Mars Geodetic System
    public static Coordinate transform(Coordinate c) {
        return transform(c.x, c.y);
    }

    public static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347) return true;
        if (lat < 0.8293 || lat > 55.8271) return true;
        return false;
    }

    public static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    public static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }
}
